EOSIO using cleos for wallet interaction

eosio_cleos_wallet_interaction.md

Suggestion about "cleos wallet open".

Perhaps we can add a bold note in the hackathon_how_to.md documentation which points out that a wallet has to be 1) opened and then 2) unlocked (always in that order).

Reason

Running the open command, after a wallet has been unlocked (re-opening or switching back to a wallet) locks the wallet.

Example

If you list the open wallets using the following command you can see 3 locked wallets

cleos wallet list
Wallets:
[
  "default",
  "eosiomain",
  "notechainwal"
]

You can unlock a wallet (say, in this case the default wallet) using the following command

cleos wallet unlock --password thePassword
Unlocked: default

If you list the open wallets again, you can see that the asterix (*) is present (indicating that the wallet has been unlocked)

cleos wallet list
Wallets:
[
  "default *",
  "eosiomain",
  "notechainwal"
]

However, if you run the following open command, it results in the wallet being locked

cleos wallet open 
Opened: default

Notice how the asterix has vanished as soon as the open command was executed

cleos wallet list
Wallets:
[
  "default",
  "eosiomain",
  "notechainwal"
]

I thought that this may confuse some people, perhaps we could point this nuance out in the documentation somewhere.